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Practice-Quiz1

# Practice-Quiz1 - b(1.5 points What is the flow velocity at...

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Physics 7B Practice Quiz 1 First two letters of last name: DL Section Number ____________ Name (last, first) ____________________________ Student ID _______________________ I certify by my signature that I will abide by the code of academic conduct of the University of California. Signature No books or notes. Calculators OK. Show all your work below. Answers alone do not receive credit! 1. Water is fed at a rate of 5 liters per minute into an irrigation pipe of 10 cm diameter. All the water from this pipe flows into a pipe of 5 cm diameter, which empties it into an irrigation ditch. a. (1.0 points) What is the flow rate of water into the ditch? Explain your reasoning in one brief sentence, then give any relevant equations and the numerical result.
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Unformatted text preview: b. (1.5 points) What is the flow velocity at the point the water flows into the ditch? Explain your reasoning in one brief sentence, then give any relevant equations and the numerical result. 2. (2.0 points) Consider the portion of a fluid circuit in equilibrium shown in the figure. Water flows with current I into the large diameter tube, then down a height change Δ h, to a smaller diameter tube. Assuming there is minimal resistance to the flow, indicate on the diagram the points of greatest and least pressure. Explain your reasoning below the diagram, using the Bernoulli equation. continuity: I = A 1 v 1 = A 2 v 2 Bernoulli equation: Δ P+ Δ ( ½ρ v 2 )+ Δ ( ρ gh) = Δ E pump /vol - IR...
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